<?php
/**
 * Created by JetBrains PhpStorm.
 * User: taoqili
 * Date: 12-7-18
 * Time: 上午11: 32
 * UEditor编辑器通用上传类
 */
class Uploader{
    private $fileField;            //文件域名
    private $file;                 //文件上传对象
    private $config;               //配置信息
    private $oriName;              //原始文件名
    private $fileName;             //新文件名
    private $fullName;             //完整文件名,即从当前配置目录开始的URL
    private $fileSize;             //文件大小
    private $fileType;             //文件类型
    private $stateInfo;            //上传状态信息,
    private $stateMap = array(     //上传状态映射表，国际化用户需考虑此处数据的国际化
        'SUCCESS' ,                //上传成功标记，在UEditor中内不可改变，否则flash判断会出错
        '文件大小超出 upload_max_filesize 限制' ,
        '文件大小超出 MAX_FILE_SIZE 限制' ,
        '文件未被完整上传' ,
        '没有文件被上传' ,
        '上传文件为空' ,
        'POST' => '文件大小超出 post_max_size 限制' ,
        'SIZE' => '文件大小超出网站限制' ,
        'TYPE' => '不允许的文件类型' ,
        'DIR' => '目录创建失败' ,
        'IO' => '输入输出错误' ,
        'UNKNOWN' => '未知错误' ,
        'MOVE' => '文件保存时出错'
    );

    /**
     * 构造函数
     * @param string $fileField 表单名称
     * @param array $config  配置项
     * @param bool $base64  是否解析base64编码，可省略。若开启，则$fileField代表的是base64编码的字符串表单名
     */
    public function __construct($fileField , $config , $base64 = false)
    {
        $this->fileField = $fileField;
        $this->config = $config;
        $this->stateInfo = $this->stateMap[0];
        $this->upFile($base64);
    }

    /**
     * 上传文件的主处理方法
     * @param $base64
     * @return mixed
     */
    private function upFile($base64)
    {
        //处理base64上传
        if ('base64' == $base64) {
            $content = $_POST[$this->fileField];
            $this->base64ToImage($content);
            return;
        }

        //处理普通上传
        $file = $this->file = $_FILES[$this->fileField];
        if (!$file) {
            $this->stateInfo = $this->getStateInfo('POST');
            return;
        }
        if ($this->file['error']) {
            $this->stateInfo = $this->getStateInfo($file['error']);
            return;
        }
        if (!is_uploaded_file($file['tmp_name'])) {
            $this->stateInfo = $this->getStateInfo('UNKNOWN');
            return;
        }

        $this->oriName = $file['name'];
        $this->fileSize = $file['size'];
        $this->fileType = $this->getFileExt();

        if (!$this->checkSize()) {
            $this->stateInfo = $this->getStateInfo('SIZE');
            return;
        }
        if (!$this->checkType()) {
            $this->stateInfo = $this->getStateInfo('TYPE');
            return;
        }
        $this->fullName = $this->getFolder() . $this->getName();
        if ($this->stateInfo == $this->stateMap[0]) {
            if (!move_uploaded_file($file['tmp_name'] , $this->fullName)) {
                $this->stateInfo = $this->getStateInfo('MOVE');
            }
        }
    }

    /**
     * 处理base64编码的图片上传
     * @param $base64Data
     * @return mixed
     */
    private function base64ToImage($base64Data)
    {
        $img = base64_decode($base64Data);
        $this->fileName = time() . rand(1 , 10000) . '.png';
        $this->fullName = $this->getFolder() . $this->fileName;
        if (!file_put_contents($this->fullName , $img)) {
            $this->stateInfo = $this->getStateInfo('IO');
            return;
        }
        $this->oriName = '';
        $this->fileSize = strlen($img);
        $this->fileType = '.png';
    }

    /**
     * 获取当前上传成功文件的各项信息
     * @return array
     */
    public function getFileInfo()
    {
        return array(
            'originalName' 	=> $this->oriName ,
            'name' 			=> $this->fileName ,
            'url' 			=> $this->fullName ,
            'size' 			=> $this->fileSize ,
            'type' 			=> $this->fileType ,
            'state' 		=> $this->stateInfo
        );
    }

    /**
     * 上传错误检查
     * @param $errCode
     * @return string
     */
    private function getStateInfo($errCode)
    {
        return !$this->stateMap[$errCode] ? $this->stateMap['UNKNOWN'] : $this->stateMap[$errCode];
    }

    /**
     * 重命名文件
     * @return string
     */
    private function getName(){
        return $this->fileName = CommonHelper::gen_uuid() . $this->getFileExt();
    }

    /**
     * 文件类型检测
     * @return bool
     */
    private function checkType()
    {
        return in_array($this->getFileExt() , $this->config['allowFiles']);
    }

    /**
     * 文件大小检测
     * @return bool
     */
    private function  checkSize()
    {
        return $this->fileSize <= ($this->config['maxSize'] * 1024);
    }

    /**
     * 获取文件扩展名
     * @return string
     */
    private function getFileExt(){
        return strtolower(strrchr($this->file['name'] , '.'));
    }

    /**
     * 按照日期自动创建存储文件夹
     * @return string
     */
    private function getFolder()
    {
        $pathStr = $this->config['savePath'];
        if (strrchr($pathStr , '/') != '/') {
            $pathStr .= '/';
        }
        if (!file_exists($pathStr)) {
            if (!CommonHelper::ymkdirs($pathStr)) {
                return false;
            }
        }
        return $pathStr;
    }
}